• For the latitudes, if you add 90 to minlat and maxlat, then you remove the negative numbers and the normal comparisons work.

  Provided that your images do not cross the North or South poles. If they do, then things get real weird and you need to move to an alternative coordinates system.

• For the longitudes, if you add 360 to both coordinates, then you remove the 0 from the picture and the math again works

#! perl -slw
use strict;
use enum qw[ IMAGENO MINLAT MAXLAT MINLON MAXLON ];

sub overlapLat {
    my( $a, $b ) = @_;
    return
        if $a->[MINLAT]+90 > $b->[MAXLAT]+90
        or $a->[MAXLAT]+90 < $b->[MINLAT]+90;
    return 1;
}

sub overlapLon {
    my( $a, $b ) = @_;
    return
        if $a->[MINLON]+360 > $b->[MAXLON]+360
        or $a->[MAXLON]+360 < $b->[MINLON]+360;
    return 1;
}

##discard header
<DATA>;

my @rects = map[ split ',' ], <DATA>;

for my $first ( 0 .. $#rects ) {
    for my $second ( $first + 1 .. $#rects ) {
        if( overlapLat( @rects[ $first, $second ] )
        and overlapLon( @rects[ $first, $second ] )
        ) {
            print "@{$rects[ $first ] } overlaps \n@{ $rects[ $second 
+] }";
        }
    }
}

__DATA__
"Image number","minlat","maxlat","minlon","maxlon"
...
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